Arlington National Cemetery

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Jewish Chaplains Plaque to be unveiled at Arlington National Cemetery. (The Jewish Federations of North America)

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ASSOCIATED PRESS Soldiers from the Army's Old Guard take photos of headstones in Section 15 of Arlington National Cemetery. Their project is to photograph and catalog the more than 219,00 grave markers and 43,000 nameplates in the columbarium.

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** FILE ** President Obama, with Maj. Gen. Karl Horst (left), commander of the U.S. Army's Military District of Washington, places a wreath at the Tomb of the Unknowns during a Memorial Day ceremony at Arlington National Cemetery in Virginia on Monday, May 30, 2011. (AP Photo/Charles Dharapak)

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A youth holds up an American flag in the crowded Memorial Amphitheater at Arlington National Cemetery in Arlington as the audience awaits the arrival of President Obama to speak at a Memorial Day ceremony on Monday, May 30, 2011. (AP Photo/Jacquelyn Martin)

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Members of the U.S. Army's 3rd Infantry Regiment pay respects at the casket of Frank W. Buckles, the last surviving American veteran of World War I, in the Memorial Amphitheater Chapel at Arlington National Cemetery in Arlington, Va., on Tuesday. Buckles died Feb. 27, 2011, in West Virginia at age 110. (Associated Press)